5.15-stable review patch. If anyone has any objections, please let me know.
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From: Stefan Wiehler stefan.wiehler@nokia.com
[ Upstream commit f1fc201148c7e684c10a72b6a3375597f28d1ef6 ]
Move address list traversal in inet_assoc_attr_size() under the sock lock to avoid holding the RCU read lock.
Suggested-by: Xin Long lucien.xin@gmail.com Fixes: 8f840e47f190 ("sctp: add the sctp_diag.c file") Signed-off-by: Stefan Wiehler stefan.wiehler@nokia.com Acked-by: Xin Long lucien.xin@gmail.com Link: https://patch.msgid.link/20251028161506.3294376-4-stefan.wiehler@nokia.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/sctp/diag.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/net/sctp/diag.c b/net/sctp/diag.c index 3631a32d96b07..2cf5ee7a698e2 100644 --- a/net/sctp/diag.c +++ b/net/sctp/diag.c @@ -230,14 +230,15 @@ struct sctp_comm_param { bool net_admin; };
-static size_t inet_assoc_attr_size(struct sctp_association *asoc) +static size_t inet_assoc_attr_size(struct sock *sk, + struct sctp_association *asoc) { int addrlen = sizeof(struct sockaddr_storage); int addrcnt = 0; struct sctp_sockaddr_entry *laddr;
list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list, - list) + list, lockdep_sock_is_held(sk)) addrcnt++;
return nla_total_size(sizeof(struct sctp_info)) @@ -263,11 +264,14 @@ static int sctp_sock_dump_one(struct sctp_endpoint *ep, struct sctp_transport *t if (err) return err;
- rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL); - if (!rep) + lock_sock(sk); + + rep = nlmsg_new(inet_assoc_attr_size(sk, assoc), GFP_KERNEL); + if (!rep) { + release_sock(sk); return -ENOMEM; + }
- lock_sock(sk); if (ep != assoc->ep) { err = -EAGAIN; goto out;